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Debt (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2018
Jul. 31, 2018
Jul. 20, 2018
Nov. 30, 2016
Jul. 31, 2012
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2015
Aug. 09, 2018
Jan. 03, 2018
May 16, 2017
Dec. 02, 2016
Feb. 01, 2016
Oct. 01, 2015
May 01, 2014
Debt [Line Items]                              
Line of Credit, Current                         $ 2,000,000    
Debt Instrument, Term   5 years                          
Line of Credit Facility, Maximum Borrowing Capacity       $ 1,500,000                      
Description Of Consolidated Fixed Charge Coverage Ratio           The Bank Loan Agreement requires Dynasil, at the close of each fiscal quarter, to maintain a Debt Service Coverage ratio, as defined, of at least 1.20 to 1.00 on a trailing four quarter basis.                  
Invest AmountIn Exchange For Preferred Stock                       $ 1,200,000      
Payment Of Subordinate Debt         $ 3,000,000     $ 2,000,000              
Debt Instrument, Maturity Date, Description           November 30, 2021                  
Amortization of Debt Issuance Costs             $ 3,000                
Debt Issuance Costs, Gross $ 64,000         $ 64,000 64,000                
Accumulated Amortization, Debt Issuance Costs 64,000         $ 64,000 $ 64,000                
Secured Debt, Outstanding Amount 500,000   $ 500,000                        
Other Research and Development Expense $ 35,000                            
Refinanced to long term debt                     $ 1,000,000   $ 2,000,000    
Middlesex Savings Bank [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 4.52%         4.52%             4.50%    
Line of Credit, Current   $ 750,000                          
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000,000         $ 4,000,000     $ 750,000           $ 4,000,000
Subordinate [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage                   7.00%          
4.52% Term Note Payable [Member] | Middlesex Savings Bank [Member]                              
Debt [Line Items]                              
Long-term Line of Credit                         $ 1,000,000    
Debt Instrument, Periodic Payment, Principal           $ 37,000                  
Debt Instrument, Maturity Date, Description           February 2021                  
14.59% Note Payable [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage             14.59%                
Debt Instrument, Periodic Payment, Principal             $ 7,000                
Maximum [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 5.25%         5.25%                  
Notes Payable to Banks [Member]                              
Debt [Line Items]                              
Debt Instrument, Description of Variable Rate Basis           (i) a security interest in substantially all of the Company’s personal property and (ii) sixty-five percent (65%) of Dynasil’s equity interests in its U.K. subsidiary, Hilger Crystals, Ltd. Under the Note, the borrowing base is determined monthly based on eligible billed and unbilled accounts receivable and eligible inventory. The interest rate under the Note is equal to the Prime Rate, but in no event less than 3.25%.                  
Masschusetts Capital Resource Corporation [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 7.00%         7.00%                  
Debt Instrument, Face Amount         $ 3,000,000                    
Debt Instrument, Periodic Payment, Principal           $ 39,000                  
Debt Instrument, Periodic Payment, Interest           $ 5,000                  
Masschusetts Capital Resource Corporation [Member] | 6.00% Note Payable [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage       6.00%     6.00%             6.00%  
Debt Instrument, Periodic Payment, Principal             $ 43,478 $ 130,000              
Optometrics Corporation [Member] | Minimum [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 5.00%         5.00%                  
Leaf Capital Funding Llc [Member] | 8.70% Note Payable [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 8.70%         8.70%                  
Debt Instrument, Periodic Payment, Principal           $ 1,000                  
Leaf Capital Funding Llc [Member] | Maximum [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 14.59%         14.59%                  
Leaf Capital Funding Llc [Member] | Minimum [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 8.70%         8.70%                  
Town Of Ayer Industrial Development Finance Authority [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 5.00%         5.00%                  
Debt Instrument, Periodic Payment, Principal           $ 17,000                  
Massachusetts Development Finance Agency [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 5.25%         5.25%                  
Debt Instrument, Periodic Payment, Principal           $ 6,000                  
Debt Instrument, Maturity Date, Description           Mar. 01, 2019                  
Xcede Technologies inc [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 5.00%     2.00%   5.00%                  
Line of Credit Facility, Maximum Borrowing Capacity       $ 1,500,000                      
Debt Instrument, Face Amount $ 2,200,000         $ 2,200,000                  
Proceeds from Convertible Debt           $ 2,900,000                  
Proceeds from Lines of Credit       $ 500,000                      
Capital Stock Financing Discount Percentage       20.00%                      
Debt Conversion, Converted Instrument, Shares Issued       5,394,120                      
Imputed Interest Rate           5.40%                  
Aggregate Indebtedness 500,000         $ 500,000                  
Other Research and Development Expense     $ 35,000                        
Xcede Note Agreement With Cook BiotechInc [Member]                              
Debt [Line Items]                              
Debt Instrument, Face Amount $ 500,000         $ 500,000                  
Equipment Line Of Credit [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage 5.66%         5.66%                  
Debt Instrument, Periodic Payment, Principal           $ 14,000                  
Debt Instrument, Maturity Date, Description           July 2023                  
Equipment Line Of Credit [Member] | Middlesex Savings Bank [Member]                              
Debt [Line Items]                              
Debt Instrument, Interest Rate, Stated Percentage   5.66%                          
Line of Credit Facility, Covenant Compliance   As part of the renewal process and due to the additional credit being extended to the Company, the Middlesex loan and security agreement was amended on August 9, 2018 to change the maximum debt leverage ratio covenant to 2.5x from 3.0x.